There is no such thing as one effective purpose. Consider what you want to use the information to achieve and imagine yourself using that information. That's your purpose. Your activation will then be pulling out the ideas you can use right now to fulfill your purpose.

Remember too that your purpose can change with the knowledge you gain. The first activation you may had one purpose and notice there is information in the book that would satisfy a different purpose. So change it. You're not stuck with your purpose just because you started activation. It's like going to the bank to find out how much money is on your account and then discovering there are ways that you may be able to increase the amount in your account by taking a loan. You now have a new purpose to find out if that is an option for you. It becomes worth investigating.

If you're not getting anything out of your activation check your purpose. Review the book. Sometimes the material isn't what you need.

Alex